5. A piston assembly initially contains 1.5 kg and 0.4 m' of air at 52 C. Later, the air is compressed at a constant temperature and its final volume is 0.2 m3. What is the boundary work done during the process (pair - 1.2 kg/ m, Rir = 0.287 kJ/kgK). a. 88,72 kJ b. 68,81 kJ c. 47,52 kJ d. 96,98 kJ e. 22,16 kJ